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Shareholders' Equity
 3 Months Ended
Apr. 30, 2012
Shareholders' Equity [Abstract]  
Shareholders' Equity

7. Shareholders' Equity

On February 28, 2006, a stock repurchase authorization by the Company's Board of Directors allowed the Company to repurchase up to 8,000,000 common shares. On November 16, 2010 and August 25, 2011, two additional stock repurchase authorizations by the Company's Board of Directors allowed the Company to repurchase, in aggregate, 20,000,000 additional common shares.

The Company repurchased all of the remaining outstanding shares available under the above authorizations during fiscal 2012. As a result, there were no share repurchases during the three months ended April 30, 2012. The Company repurchased and subsequently retired 4,824,869 common shares at a total cost of $148,674 during the three months ended April 30, 2011. The average cost per share of the repurchases was $30.81, including commissions.

As a result of the share repurchases for the three months ended April 30, 2011, the Company reduced the balance of additional paid-in-capital to zero, which required subsequent share repurchases to be recorded as a reduction of retained earnings. As a result, the Company reduced retained earnings by $115,778 during the three months ended April 30, 2011.